fix: address Copilot review round 1 on #2323

All nine findings taken.

Two budgets I had lowered are restored as named exceptions rather than folded
into the shared value. cli's e2e child timer goes back to 15s and the two tests
that spawn it get E2E_SPAWN_MS = 25s, so the bound carrying the diagnostic still
wins without taking load tolerance off the one suite that spawns a real process.
App.test.tsx's three-modal sequence keeps THREE_MODAL_SEQUENCE_MS = 20s — a
value chosen against an observed failure, which the shared ceiling would have
replaced with a general one.

Three real false-positive paths in the guard are closed. It now discovers every
Vitest config under clients/ and fails on one it is not configured to check —
without which "a project with no row is an error" was vacuous, since an
undiscovered config yields no project to reject. It strips comments before
looking for configure() and requires the exact expected value, so neither a
commented-out call nor asyncUtilTimeout: 1 passes. And it compares each
resolved project's setupFiles against the site it claims to configure, so
deleting a setupFiles entry can no longer leave both projects reported as
configured while Testing Library silently reverts to 1000ms. Each has a test,
and the setupFiles check was observed to fire against a real deletion.

Three stale comments the change had invalidated: main.yml still counted four
durable guards, PreviewAnnotations.stories.tsx still said the storybook project
had no setupFiles, and the new AGENTS.md rule read as though no Group F row had
been settled when this PR settles F6. browser-timeouts.test.mjs gains the
purpose header this repo's files carry.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PsmUAZ6aLUAFqenjJKSSRp
Signed-off-by: cliffhall <cliff@futurescale.com>

.github/workflows/main.yml

@@ -38,8 +38,9 @@ jobs:
         run: npm install
 
       - name: Validate (coverage guards, format, lint, typecheck, build, fast tests)
-        # Runs the four durable guards first (verify:format-coverage,
-        # verify:skills, verify:typecheck-coverage, verify:dep-lockstep), then
+        # Runs the five durable guards first (verify:format-coverage,
+        # verify:skills, verify:typecheck-coverage, verify:dep-lockstep,
+        # verify:test-timeouts), then
         # test:scripts, then validate:core, then each client's
         # self-validation: format:check + lint + typecheck + build + test (no
         # coverage instrumentation — fast). This also builds every client bundle